It's the hospital you'll know from the hugely popular Channel 4 show 24 Hours in A&E.

The incredible work of medics in St George's Hospital accident and emergency department is on show each week.

But away from the cameras, the hospital's heart unit is troubled. And more details continue to emerge about just how troubled it has been.

It has now been revealed that the deaths of up to 250 patients who died following heart surgery at the hospital in Tooting are to be reviewed.

Complex heart surgery at the hospital was suspended last year in a bid to tackle the problems, amid claims that a "toxic" feud between two rival camps had left staff feeling a high death rate was inevitable.

Now the review, commissioned by NHS Improvement, will look at deaths between April 2013 and September 2018.

In April 2017 changes were brought in which were meant to bring improvements. A panel will look into whether these had any impact.

During the review, the medical records of those who died will be examined, as will any investigations conducted at the time of the deaths.

Families of patients will be contacted if the panel has "any significant concerns about their care".

What does the hospital have to say?

Jacqueline Totterdell, chief executive at St George's, said: "It is absolutely essential that patients and their families have full confidence in the care our cardiac surgery team provide - and this review of past deaths will be a key part of that process."

The review only applies to cardiac surgery at St George's, and does not include other associated specialities - for example, cardiology.

The panel will examine the safety and quality of care that patients who died during or after cardiac surgery at St George's received, and are likely to review up to 250 deaths as part of this process, which will take between six and 12 months to complete.

Tell us more about this feud

St George's Hospital's heart unit was consumed by a "dark force" and patients were put at risk by a dysfunctional team of surgeons, an investigation concluded.

The damning review was written by former NHS England deputy medical director Mike Bewick in response to high mortality rates at the hospital.

He found the South London facility had a cardiac surgery death rate of 3.7% - above the national 2% average.

Internal scrutiny was said to be "inadequate" and the department was divided between "two camps" exhibiting "tribal-like activity".

Professor Bewick's review was quoted as saying: "Some felt that there was a persistent toxic atmosphere and stated that there was a 'dark force' in the unit."

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It added: "In our view the whole team shares responsibility for the failure to significantly improve professional relationships and to a degree surgical mortality."

Conversations with 39 staff revealed they were shocked by the death rate, but "most felt that poor performance was inevitable due to the pervading atmosphere".

The independent reviewer examined "disturbing and often difficult information", concluding an "existential threat" was posed to the unit because staff and patients would go elsewhere if problems persisted.

Stronger leadership and "new blood" were called for, while the "defensive approach" the unit took to death rate data was criticised.